A doubt..

Hey guys, i have a question regarding photo elements, here goes, for instance if we use some cropped speakers or some other elements (from a free licensed/commercial-use/no attribution photo) in our flyer template to place in the background or something that isnt the main focus, do we have to report this item, as in link to it?
I ask this because over the years ive saved hundreds and hundreds of pictures in my library, and of course i dont know the link source already, thats why i need to know if those elements need to be “linked”, of course main elements like models and such need linkage, but i wasnt sure about this background ones, same apply to textures for example, do we need to link to them ?

as per general copyright rules, you are supposed to “declare” anything that is not personal intellectual property. That being said, it’s also somewhat obvious that if you’re using something, you have a license to do so, regardless of the amount of space it occupies within the final design, and linking to it should not be a problem.